Can you borrow another computer and modem/router to check your line? It is possible your computer is at fault. The BT engineer should have checked you line on his laptop and told you if it was a line fault.
What is ransomware and how do I protect my PC from WannaCry?
What I learned from my mentor, Oscar-winning VFX supervisor Phil Tippett
Siri vs Google Assistant
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.